[PATCH 10/17] netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change
From: <hidden>
Date: 2011-11-21 05:47:46
Also in:
netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Patrick McHardy <redacted> Expand the skb headroom if the oif changed due to rerouting similar to how IPv4 packets are handled. Signed-off-by: Patrick McHardy <redacted> --- net/ipv6/netfilter.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 30fcee4..d39e954 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c@@ -14,6 +14,7 @@ int ip6_route_me_harder(struct sk_buff *skb) { struct net *net = dev_net(skb_dst(skb)->dev); const struct ipv6hdr *iph = ipv6_hdr(skb); + unsigned int hh_len; struct dst_entry *dst; struct flowi6 fl6 = { .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
@@ -46,6 +47,12 @@ int ip6_route_me_harder(struct sk_buff *skb) } #endif + /* Change in oif may mean change in hh_len. */ + hh_len = skb_dst(skb)->dev->hard_header_len; + if (skb_headroom(skb) < hh_len && + pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC)) + return -1; + return 0; } EXPORT_SYMBOL(ip6_route_me_harder);
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1.7.1